1998 Fiscal Year Final Research Report Summary
Studies on Precise estimation of local mechanical properly change of irradiated fusion materials
| Project/Area Number |
08458137
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Nuclear fusion studies
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| Research Institution | National Institute for Fusion Science |
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Principal Investigator |
MUROGA Takeo National Institute for Fusion Science, Fusion Engineering Research Centor, Professor, 炉工学研究センター, 教授 (60174322)
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| Co-Investigator(Kenkyū-buntansha) |
NAGASAKA Takuya National Institue for Fusion Science, Fusion Engineering Rsearch Center, Research Associate, 炉工学研究センター, 助手 (40311203)
INOUE Noriyuki National Institue for Fusion Science, Department of LHD project, Research Associate, 大型ヘリカル研究所, 助手 (20249965)
NISHIMURA Arata National Institute for Fusion Science, Department of LHD project, Associate Professor, 大型ヘリカル研究所, 助教授 (60156099)
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| Project Period (FY) |
1996 – 1998
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| Keywords | fusion materials / micro hardness / radiation damage / ion irradiation / mechamical property / fracture foughness |
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| Research Abstract |
Microhardness of heavy-ion irradiated materials has been carried out by means of microindentation. The analysis code for the estimation of hardness of the thin surface layer using the load-indentation depth curve during loading and unloading was developed and applied to
1. Helium co-implanted low antivation ferritic steel irradiated with Ni ions
2. Tantalum irradiated with Cu ions and
3. Si02 irradiated with He or H ions.
The hardness increase of the low activation ferritic steel was found to be proportional to the amount of helium implanted, regardless of the irradiation dose. Microstructure and hardness change were well correlated taking into account the TEM-invisible vacancy defect clustgers, whose concentration was estimated to increase proportional to square root of the fluence. Young' s modulus, as well as hardness, was shown to change by irradiation in SiO2.
The present studies have contributed to improving the micro-indentation technique and enhancing understanding of ion irradiation-induced mechanical property change.
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